Triethylamine → (3aR,5R,6R,7R,7aR)-5-(acetoxymethyl)-2-methyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]oxazole-6,7-diyl diacetate

Participants

Reaction Conditions

Reaction Steps

Commercially available acetic acid (2S,3R,4R,5R,6R)-4,5-diacetoxy-6-acetoxymethyl-3-acetylamino-tetrahydro-pyran-2-yl ester (10.0 g, 26 mmol) was dissolved in 116 mL of abs. CH2Cl2 and treated with trimethylsilyl triflate (14.27 g, 64 mmol). The reaction was allowed to proceed over night at 45° C. After cooling to 0° C., triethylamine (4.88 ml, 35 mmol) was added, the mixture diluted with CH2Cl2 and washed with NaHCO3-solution and water. Drying over Na2SO4 and evaporation of the solvent yielded 10.3 g of the title compound as brownish oil which was used without further purification for the next step. MS (ISP): 330.0 [M+H]+.

Provenance & Evidence